Thirteenth General Conference of Weights and Measures.
D002586:Cesium / Q000592:standards; D007391:International Cooperation; D010297:Paris; D010783:Photometry; D055585:Physical Phenomena; D010825:Physics; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors / Q000592:standards; D014894:Weights and Measures / Q000592:standards*
D002586:Cesium